[Bug 741263] videodecoder: implement caps query

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741263
  GStreamer | gst-plugins-base | unspecified

--- Comment #21 from Thiago Sousa Santos <thiagossantos at gmail.com> 2014-12-17 18:27:46 UTC ---
Created an attachment (id=292919)
 View: https://bugzilla.gnome.org/attachment.cgi?id=292919
 Review: https://bugzilla.gnome.org/review?bug=741263&attachment=292919

videodecoder: expose getcaps virtual function

Allows subclasses to do custom caps query replies.

Also exposes the standard caps query handler so subclasses can just
extend on top of it instead of reimplementing the caps query proxying.

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